After a delay of nearly two weeks, Rams quarterback Sam Bradford underwent surgery on his left knee Monday according to head coach Jeff Fisher.

Bradford suffered a torn anterior cruciate ligament (ACL) in the team’s loss at Carolina on Oct. 20 when he landed awkwardly after being shoved out of bounds by Panthers safety Mike Mitchell.

The surgery, which was performed by Dr. James Andrews in Pensacola, Fla., originally was scheduled for Nov. 5 and then postponed to allow swelling around the knee to subside.

Rams head athletic trainer Reggie Scott also was in Pensacola for the procedure and told Fisher the surgery was a success.

Scott “said everything went very, very well,” Fisher told the media following Tuesday’s practice at Rams Park. “It’s a very, very healthy knee considering the circumstances, and so they were pleased.”

A fourth-year pro, Bradford, was in the midst of his best season, having completed 60.7 percent of his passes (159 of 262), for 1,687 yards, 14 touchdowns and just four interceptions. His passer rating was 90.9.

Despite the injury, Bradford has maintained a presence at Rams Park, doing whatever he can for new starter Kellen Clemens and backups Austin Davis and Brady Quinn.

“I’m basically just here to help,” Bradford said late last month. “It’s kind of a little bit of a role reversal. Kellen’s been here for me a lot over the past couple years, and I’m trying to do the same thing for him that he’s done for me.

“Sitting in the meeting room with him, watching tape. If he asks me my opinion, I’ll be happy to give it to him, tell him things that I see at practice. Just little things like that, and overall just be there for support really.”

Fisher also shed some light Tuesday on the injury that has limited Quinn to just a handful of practices since signing with the club in the days following Bradford’s season-ending injury.

Quinn’s injury had been reported as a hip issue, but Fisher said Tuesday it was a back injury.

“Brady had some issues with his low back in the weight room,” Fisher said. “It was just kind of a freak thing, and we’re trying to get him back as quick as we can.”

Davis, the Rams No. 3 quarterback in 2012, was re-signed after Bradford went down and has been backing up Clemens in recent weeks. Davis, a second-year pro, was cut at the end of training camp.